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ions-and-numerics-by-martin-sadd/ElasticityTheory, Applications, andNumericsFOURTH EDITIONMartin H. SaddProfessor Emeritus, University of Rhode Island, Department of MechanicalEngineering and Applied Mechanics, Kingston, Rhode Island
ions-and-numerics-by-martin-sadd/Table of ContentsCover imageTitle pageCopyrightPrefaceAcknowledgmentsAbout the AuthorPart 1. Foundations and elementary applicationsChapter 1. Mathematical preliminaries1.1. Scalar, vector, matrix, and tensor definitions1.2. Index notation1.3. Kronecker delta and alternating symbol1.4. Coordinate transformations1.5. Cartesian tensors
ions-and-numerics-by-martin-sadd/1.6. Principal values and directions for symmetric second-ordertensors1.7. Vector, matrix, and tensor algebra1.8. Calculus of Cartesian tensors1.9. Orthogonal curvilinear coordinatesChapter 2. Deformation: Displacements and strains2.1. General deformations2.2. Geometric construction of small deformation theory2.3. Strain transformation2.4. Principal strains2.5. Spherical and deviatoric strains2.6. Strain compatibility2.7. Curvilinear cylindrical and spherical coordinatesChapter 3. Stress and equilibrium3.1. Body and surface forces3.2. Traction vector and stress tensor3.3. Stress transformation3.4. Principal stresses3.5. Spherical, deviatoric, octahedral, and von Mises stresses
ions-and-numerics-by-martin-sadd/3.6. Stress distributions and contour lines3.7. Equilibrium equations3.8. Relations in curvilinear cylindrical and spherical coordinatesChapter 4. Material behavior—linear elastic solids4.1. Material characterization4.2. Linear elastic materials—Hooke's law4.3. Physical meaning of elastic moduli4.4. Thermoelastic constitutive relationsChapter 5. Formulation and solution strategies5.1. Review of field equations5.2. Boundary conditions and fundamental problem classifications5.3. Stress formulation5.4. Displacement formulation5.5. Principle of superposition5.6. Saint–Venant's principle5.7. General solution strategies5.8. Singular elasticity solutionsChapter 6. Strain energy and related principles
ions-and-numerics-by-martin-sadd/6.1. Strain energy6.2. Uniqueness of the elasticity boundary-value problem6.3. Bounds on the elastic constants6.4. Related integral theorems6.5. Principle of virtual work6.6. Principles of minimum potential and complementary energy6.7. Rayleigh–Ritz methodChapter 7. Two-dimensional formulation7.1. Plane strain7.2. Plane stress7.3. Generalized plane stress7.4. Antiplane strain7.5. Airy stress function7.6. Polar coordinate formulationChapter 8. Two-dimensional problem solution8.1. Cartesian coordinate solutions using polynomials8.2. Cartesian coordinate solutions using Fourier methods8.3. General solutions in polar coordinates8.4. Example polar coordinate solutions
ions-and-numerics-by-martin-sadd/8.5. Simple plane contact problemsChapter 9. Extension, torsion, and flexure of elastic cylinders9.1. General formulation9.2. Extension formulation9.3. Torsion formulation9.4. Torsion solutions derived from boundary equation9.5. Torsion solutions using Fourier methods9.6. Torsion of cylinders with hollow sections9.7. Torsion of circular shafts of variable diameter9.8. Flexure formulation9.9. Flexure problems without twistPart 2. Advanced applicationsChapter 10. Complex variable methods10.1. Review of complex variable theory10.2. Complex formulation of the plane elasticity problem10.3. Resultant boundary conditions10.4. General structure of the complex potentials10.5. Circular domain examples
ions-and-numerics-by-martin-sadd/10.6. Plane and half-plane problems10.7. Applications using the method of conformal mapping10.8. Applications to fracture mechanics10.9. Westergaard method for crack analysisChapter 11. Anisotropic elasticity11.1. Basic concepts11.2. Material symmetry11.3. Restrictions on elastic moduli11.4. Torsion of a solid possessing a plane of material symmetry11.5. Plane deformation problems11.6. Applications to fracture mechanics11.7. Curvilinear anisotropic problemsChapter 12. Thermoelasticity12.1. Heat conduction and the energy equation12.2. General uncoupled formulation12.3. Two-dimensional formulation12.4. Displacement potential solution12.5. Stress function formulation12.6. Polar coordinate formulation
ions-and-numerics-by-martin-sadd/12.7. Radially symmetric problems12.8. Complex variable methods for plane problemsChapter 13. Displacement potentials and stress functions:Applications to three-dimensional problems13.1. Helmholtz displacement vector representation13.2. Lamé's strain potential13.3. Galerkin vector representation13.4. Papkovich–Neuber representation13.5. Spherical coordinate formulations13.6. Stress functionsChapter 14. Nonhomogeneous elasticity14.1. Basic concepts14.2. Plane problem of a hollow cylindrical domain under uniformpressure14.3. Rotating disk problem14.4. Point force on the free surface of a half-space14.5. Antiplane strain problems14.6. Torsion problemChapter 15. Micromechanics applications
ions-and-numerics-by-martin-sadd/15.1. Dislocation modeling15.2. Singular stress states15.3. Elasticity theory with distributed cracks15.4. Micropolar/couple-stress elasticity15.5. Elasticity theory with voids15.6. Doublet mechanics15.7. Higher gradient elasticity theoriesChapter 16. Numerical finite and boundary element methods16.1. Basics of the finite element method16.2. Approximating functions for two-dimensional lineartriangular elements16.3. Virtual work formulation for plane elasticity16.4. FEM problem application16.5. FEM code applications16.6. Boundary element formulationAppendix A. Basic field equations in Cartesian, cylindrical, andspherical coordinatesAppendix B. Transformation of field variables between Cartesian,cylindrical, and spherical components
ions-and-numerics-by-martin-sadd/Appendix C. MATLAB PrimerAppendix D. Review of mechanics of materialsIndex
ions-and-numerics-by-martin-sadd/CopyrightAcademic Press is an imprint of Elsevier125 London Wall, London EC2Y 5AS, United Kingdom525 B Street, Suite 1650, San Diego, CA 92101, United States50 Hampshire Street, 5th Floor, Cambridge, MA 02139, United StatesThe Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UnitedKingdomCopyright 2021 Elsevier Inc. All rights reserved.No part of this publication may be reproduced or transmitted in anyform or by any means, electronic or mechanical, includingphotocopying, recording, or any information storage and retrievalsystem, without permission in writing from the publisher. Details onhow to seek permission, further information about the Publisher’spermissions policies and our arrangements with organizations such asthe Copyright Clearance Center and the Copyright Licensing Agency,can be found at our website: www.elsevier.com/permissions.This book and the individual contributions contained in it areprotected under copyright by the Publisher (other than as may benoted herein).MATLAB is a trademark of The MathWorks, Inc. and is used withpermission. The MathWorks does not warrant the accuracy of the textor exercises in this book.This book’s use or discussion of MATLAB software or relatedproducts does not constitute endorsement or sponsorship by TheMathWorks of a particular pedagogical approach or particular use of
ions-and-numerics-by-martin-sadd/the MATLAB software.NoticesKnowledge and best practice in this field are constantly changing. Asnew research and experience broaden our understanding, changes inresearch methods, professional practices, or medical treatment maybecome necessary.Practitioners and researchers must always rely on their ownexperience and knowledge in evaluating and using any information,methods, compounds, or experiments described herein. In using suchinformation or methods they should be mindful of their own safetyand the safety of others, including parties for whom they have aprofessional responsibility.To the fullest extent of the law, neither the Publisher nor the authors,contributors, or editors, assume any liability for any injury and/ordamage to persons or property as a matter of products liability,negligence or otherwise, or from any use or operation of any methods,products, instructions, or ideas contained in the material herein.Library of Congress Cataloging-in-Publication DataA catalog record for this book is available from the Library ofCongressBritish Library Cataloguing-in-Publication DataA catalogue record for this book is available from the British LibraryISBN: 978-0-12-815987-3For information on all Academic Press publications visit our websiteat https://www.elsevier.com/books-and-journals
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ions-and-numerics-by-martin-sadd/PrefaceAs with the previous works, this fourth edition continues the author'sefforts to present linear elasticity with complete and concisetheoretical development, numerous and contemporary applications,and enriching numerics to aid in problem solution andunderstanding. Over the years the author has given much thought onwhat should be taught to students in this field and what educationaloutcomes would be expected. Theoretical topics that are related to thefoundations of elasticity should be presented in sufficient detail thatwill allow students to read and generally understand contemporaryresearch papers. Related to this idea, students should acquirenecessary vector and tensor notational skills and understandfundamental development of the basic field equations. Studentsshould also have a solid understanding of the formulation andsolution of various elasticity boundary-value problems that include avariety of domain and loading geometries. Finally, students should beable to apply modern engineering software (MATLAB, Maple orMathematica) to aid in the solution, evaluation and graphical displayof various elasticity problem solutions. These points are allemphasized in this text.In addition to making numerous small corrections andclarifications, several new items have been added. A new section inChapter 5 on singular elasticity solutions has been introduced togenerally acquaint students with this type of behavior. Cubicanisotropy has now been presented in Chapter 11 as anotherparticular form of elastic anisotropy. Inequality elastic modulirestrictions for various anisotropic material models have been betterorganized in a new table in Chapter 11. The general Naghdi-Hsusolution has now been introduced in Chapter 13. An additionalmicromechanical model of gradient elasticity has been added inChapter 15. A couple of new MATLAB codes in Appendix C have
ions-and-numerics-by-martin-sadd/been added and all codes are now referenced in the text where theyare used. With the addition of 31 new exercises, the fourth editionnow has 441 total exercises. These problems should provideinstructors with many new and previous options for homework,exams, or material for in-class presentations or discussions. The onlineSolutions Manual has been updated and corrected and includessolutions to all exercises in the new edition. All text editions followthe original lineage as an outgrowth of lecture notes that I have usedin teaching a two-course sequence in the theory of elasticity. Part I ofthe text is designed primarily for the first course, normally taken bybeginning graduate students from a variety of engineering disciplines.The purpose of the first course is to introduce students to theory andformulation, and to present solutions to some basic problems. In thisfashion students see how and why the more fundamental elasticitymodel of deformation should replace elementary strength of materialsanalysis. The first course also provides foundation for more advancedstudy in related areas of solid mechanics. Although the moreadvanced material included in Part II has normally been used for asecond course, I often borrow selected topics for use in the first course.The elasticity presentation in this book reflects the words used in thetitle - theory, applications, and numerics. Because theory provides thefundamental cornerstone of this field, it is important to first provide asound theoretical development of elasticity with sufficient rigor togive students a good foundation for the development of solutions to abroad class of problems. The theoretical development is carried out inan organized and concise manner in order to not lose the attention ofthe less mathematically inclined students or the focus of applications.With a primary goal of solving problems of engineering interest, thetext offers numerous applications in contemporary areas, includinganisotropic composite and functionally graded materials, fracturemechanics, micromechanics modeling, thermoelastic problems, andcomputational finite and boundary element methods. Numeroussolved example problems and exercises are included in all chapters.The new edition continues the special use of integrated numerics.By taking the approach that applications of theory need to be
ions-and-numerics-by-martin-sadd/observed through calculation and graphical display, numerics isaccomplished through the use of MATLAB, one of the most popularengineering software packages. This software is used throughout thetext for applications such as stress and strain transformation,evaluation and plotting of stress and displacement distributions, finiteelement calculations, and comparisons between strength of materialsand analytical and numerical elasticity solutions. With numerical andgraphical evaluations, application problems become more interestingand useful for student learning. Other software such as Maple orMathematica could also be used.
ions-and-numerics-by-martin-sadd/Contents summaryPart I of the book emphasizes formulation details and elementaryapplications. Chapter 1 provides a mathematical background for theformulation of elasticity through a review of scalar, vector, and tensorfield theory. Cartesian tensor notation is introduced and is usedthroughout the book's formulation sections. Chapter 2 covers theanalysis of strain and displacement within the context of smalldeformation theory. The concept of strain compatibility is alsopresented in this chapter. Forces, stresses, the equilibrium concept andvarious stress contour lines are developed in Chapter 3. Linear elasticmaterial behavior leading to the generalized Hooke's law is discussedin Chapter 4, which also briefly presents nonhomogeneous,anisotropic, and thermoelastic constitutive forms. Later chapters morefully investigate these types of applications. Chapter 5 collects thepreviously derived equations and formulates the basic boundaryvalue problems of elasticity theory. Displacement and stressformulations are constructed and general solution strategies areidentified. This is an important chapter for students to put the theorytogether. Chapter 6 presents strain energy and related principles,including the reciprocal theorem, virtual work, and minimumpotential and complementary energy. Two-dimensional formulationsof plane strain, plane stress, and antiplane strain are given in Chapter7. An extensive set of solutions for specific two dimensional problemsis then presented in Chapter 8, and many applications employingMATLAB are used to demonstrate the results. Analytical solutions arecontinued in Chapter 9 for the Saint-Venant extension, torsion, andflexure problems. The material in Part I provides a logical and orderlybasis for a sound one-semester beginning course in elasticity. Selectedportions of the text's second part could also be incorporated into sucha course. Part II delves into more advanced topics normally covered ina second course. The powerful method of complex variables for theplane problem is presented in Chapter 10, and several applications tofracture mechanics are given. Chapter 11 extends the previous
ions-and-numerics-by-martin-sadd/isotropic theory into the behavior of anisotropic solids with emphasison composite materials. This is an important application and, again,examples related to fracture mechanics are provided. Curvilinearanisotropy including both cylindrical and spherical orthotropy isincluded in this chapter to explore some basic problem solutions withthis type of material structure. An introduction to thermoelasticity isdeveloped in Chapter 12, and several specific application problemsare discussed, including stress concentration and crack problems.Potential methods, including both displacement potentials and stressfunctions, are presented in Chapter 13. These methods are used todevelop several three-dimensional elasticity solutions.Chapter 14 covers nonhomogeneous elasticity, and this material isunique among current standard elasticity texts. After briefly coveringtheoretical formulations, several two-dimensional solutions aregenerated along with comparison field plots with the correspondinghomogeneous cases. Chapter 15 presents a collection of elasticityapplications to problems involving micromechanics modeling.Included are applications for dislocation modeling, singular stressstates, solids with distributed cracks, micropolar, distributed voids,doublet mechanics and higher gradient theories. Chapter 16 providesa brief introduction to the powerful numerical methods of finite andboundary element techniques. Although only two-dimensional theoryis developed, the numerical results in the example problems provideinteresting comparisons with previously generated analyticalsolutions from earlier chapters. This fourth edition of Elasticityconcludes with four appendices that contain a concise summarylisting of basic field equations; transformation relations betweenCartesian, cylindrical, and spherical coordinate systems; a MATLABprimer; and a self-contained review of mechanics of materials.
ions-and-numerics-by-martin-sadd/The subjectElasticity is an elegant and fascinating subject that deals withdetermination of the stress, strain, and displacement distribution in anelastic solid under the influence of external forces. Following the usualassumptions of linear, small-deformation theory, the formulationestablishes a mathematical model that allows solutions to problemsthat have applications in many engineering and scientific fields suchas: Civil engineering applications include important contributionsto stress and deflection analysis of structures, such as rods,beams, plates, and shells. Additional applications lie ingeomechanics involving the stresses in materials such as soil,rock, concrete, and asphalt. Mechanical engineering uses elasticity in numerous problemsin analysis and design of machine elements. Such applicationsinclude general stress analysis, contact stresses, thermal stressanalysis, fracture mechanics, and fatigue. Materials engine
Martin H. Sadd Professor Emeritus, University of Rhode Island, Department of Mechanical Engineering and Applied Mechanics, Kingston, Rhode Island . solution of various elasticity boundary-value problems that include a variety of domain and loading geometries. Finally, students should be
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612 Chapter 7 Systems of Equations and Inequalities 3. (a) is nota solution. (b) is a solution. (c) is nota solution. (d) 1, 2 is nota solution. 2 2e 1 0, 13 3 2e0 0, 2 3 0 28 2 2 2 2e0 2, 0 0 2e 2 3x y 2 y 2ex 4. (a) is nota solution. (b) is a solution. (c) is a solution. (d) 2
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The access points within a mesh network operate in one of the following two ways: 1. Root access point (RAP) 2. Mesh access point (MAP) Note All access points are configured and shipped as mesh access points. To use an access point as a root access point, you must reconfigure the mesh access point to a root access point. In all mesh networks,
